findElectromagneticProperties

Find electromagnetic material properties assigned to geometric region

Since R2021a

Domain-specific electromagnetic workflow is not recommended. New features might not be compatible with this workflow. For help migrating your existing code to the unified finite element workflow, see Migration from Domain-Specific to Unified Workflow.

Syntax

emProperties = findElectromagneticProperties(materialProperties,RegionType,RegionID)

Description

emProperties = findElectromagneticProperties(materialProperties,RegionType,RegionID) returns the electromagnetic material properties assigned to the specified region of the specified model.

Examples

Find Relative Permittivity for Faces of 2-D Geometry

Create an electromagnetic model for an electrostatic analysis.

emagmodel = createpde("electromagnetic","electrostatic");

Include the L-shaped membrane geometry in the model and plot it with the face labels.

geometryFromEdges(emagmodel,@lshapeg);
pdegplot(emagmodel,"FaceLabels","on")
ylim([-1.1 1.1])
axis equal

Specify the vacuum permittivity value in the SI system of units.

emagmodel.VacuumPermittivity = 8.8541878128E-12;

Specify a different value of relative permittivity for each face.

electromagneticProperties(emagmodel,"RelativePermittivity",2.5, ...
                                    "Face",1);
electromagneticProperties(emagmodel,"RelativePermittivity",2.25, ...
                                    "Face",2);
electromagneticProperties(emagmodel,"RelativePermittivity",1, ...
                                    "Face",3);

Check the electromagnetic material properties specification for each face.

findElectromagneticProperties(emagmodel.MaterialProperties,"Face",1)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Face'
                RegionID: 1
    RelativePermittivity: 2.5000
    RelativePermeability: []
            Conductivity: []

findElectromagneticProperties(emagmodel.MaterialProperties,"Face",2)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Face'
                RegionID: 2
    RelativePermittivity: 2.2500
    RelativePermeability: []
            Conductivity: []

findElectromagneticProperties(emagmodel.MaterialProperties,"Face",3)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Face'
                RegionID: 3
    RelativePermittivity: 1
    RelativePermeability: []
            Conductivity: []

Find Relative Permeability for Cells of 3-D Geometry

Create and plot a geometry consisting of two nested spheres.

gm = multisphere([5 15]);
pdegplot(gm,"CellLabels","on","FaceAlpha",0.3)

Create an electromagnetic model for magnetostatic analysis.

emagmodel = createpde("electromagnetic","magnetostatic");

Include the geometry in the model.

emagmodel.Geometry = gm;

Specify the vacuum permeability value in the SI system of units.

emagmodel.VacuumPermeability = 1.2566370614E-6;

Specify a different value of relative permittivity for each cell.

electromagneticProperties(emagmodel,"RelativePermittivity",2.5, ...
                                    "Cell",1);
electromagneticProperties(emagmodel,"RelativePermittivity",2.25, ...
                                    "Cell",2);

Check the electromagnetic material properties specification for each cell.

findElectromagneticProperties(emagmodel.MaterialProperties,"Cell",1)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Cell'
                RegionID: 1
    RelativePermittivity: 2.5000
    RelativePermeability: []
            Conductivity: []

findElectromagneticProperties(emagmodel.MaterialProperties,"Cell",2)

ans = 
  ElectromagneticMaterialAssignment with properties:

              RegionType: 'Cell'
                RegionID: 2
    RelativePermittivity: 2.2500
    RelativePermeability: []
            Conductivity: []

Input Arguments

materialProperties — Material properties of electromagnetic model

MaterialProperties property

Material properties of an electromagnetic model, specified as the MaterialProperties property of the model.

Example: emagmodel.MaterialProperties

RegionType — Geometric region type

"Face" for a 2-D model | "Cell" for a 3-D model

Geometric region type, specified as "Face" for a 2-D geometry or "Cell" for a 3-D geometry.

Data Types: char | string

RegionID — Region ID

vector of positive integers

Region ID, specified as a vector of positive integers. Find the face or cell IDs by using pdegplot with the "FaceLabels" or "CellLabels" name-value argument set to "on".

Data Types: double

Output Arguments

emProperties — Material properties assignment

ElectromagneticMaterialAssignment object

Material properties assignment, returned as an ElectromagneticMaterialAssignment object. For more information, see ElectromagneticMaterialAssignment Properties.

Version History

Introduced in R2021a